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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26722f349321d50e0f2d9e7181e484d4d367c659e7744d405d7475d16dc7ba78' 
  AND token = 'yj2TC4p3j+s+qpnu/EqOG7vQt215Icbznf0ig8e+ip8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}